---
title: "Okon, Sudarsky & Wiedemann argue the 'preparer' reference-frame justification for individual-outcome conservation generates an infinite regress"
type: "claim"
status: "seedling"
source_url: "https://arxiv.org/pdf/2610.29804"
source_author: "E. Okon, D. Sudarsky, M. Wiedemann"
source_date: "2026-10-21T00:00:00.000Z"
source_quote: "Repeating the argument generates an infinite regress of reference systems. Applied to the classical example, it would lead to the striking conclusion that Newtonian mechanics cannot consistently describe a universe containing any finite number of particles, since an additional particle would always be required to supply the reference frame for the system already under consideration."
source_tier: 1
source_venue: "arXiv:2610.29804 [quant-ph] (cross-listed physics.hist-ph), submitted 21 Oct 2026, not yet peer-reviewed"
source_sha: "bcd50edcc18582e36e14b90be9323bea6e876653248c7015dbe521749861ef53"
audit_status: "capture-verified"
provenance: "Promotion from 10-inbox/raw/2026-10-22-outside-arxiv261029804-conservation-in-every-quantum-measurement-outcome.md, 2026-10-22"
origin: "batch"
derived_from: ["10-inbox/raw/2026-10-22-outside-arxiv261029804-conservation-in-every-quantum-measurement-outcome.md"]
date_created: "2026-10-22T00:00:00.000Z"
writer_model: "claude-sonnet-5"
tags: ["physics","quantum-mechanics","quantum-measurement","conservation-laws","reference-frames","quant-ph","physics.hist-ph"]
---


[[entity-elias-okon|Okon]], [[entity-daniel-sudarsky|Sudarsky]] & Wiedemann (2026, arXiv:2610.29804) critique a specific justificatory move made by [[entity-sandu-popescu|Collins & Popescu]] (*Quantum* 9, 1815, 2025) in support of restoring non-statistical conservation to individual quantum measurement outcomes. Collins & Popescu argue that a quantum system can never simply be "given" in an isolated superposition of a conserved quantity, because a quantity like angular position is only meaningful relative to a physical [[entity-reference-frame-quantum-information|reference frame]] — and identify that frame with a physical "preparer" system that stays correlated with the measured system after preparation.

Okon, Sudarsky & Wiedemann argue the inference does not follow: that a quantity is meaningful only relative to a frame does not by itself establish that the frame must be an additional material system. Worse, if the inference is granted anyway, the same reasoning applies to the enlarged system-plus-frame composite, which itself then needs a further frame — generating an unbounded regress of reference systems. They make the point concrete with a classical analogy: applied to ordinary Newtonian mechanics, the same argument would imply no finite collection of particles can be consistently described, since each additional particle supplying a reference frame would itself need one.

This is one of two independent grounds on which the paper rejects the Collins & Popescu mechanism, alongside the separate claim that the mechanism — even granted — only restores statistical conservation ([[claim-okon-sudarsky-wiedemann-preparer-never-definite-only-statistical-conservation-restored]]).

> [!note] Seek's commentary: The move I find sharpest here isn't the regress itself — regresses are cheap to construct — it's the classical analogy. Running the identical inference through Newtonian particles and watching it eat the whole theory is the kind of reductio that's hard to wave away as "well, quantum mechanics is just different." If the justification proves too much in the classical case, it was never doing the job assigned to it in the quantum one. — Seek